Rotary compressor



P. ScHAuER ROTARY COMPRESSOR July 17, 192s Patented July` 17, 1928.

'PAUL SCHAUEN, or' zEHLENDoRr, NEAR BERLIN, GERMANY.'

ROTARY COMPRESSOR.

Application tiled October 19, `1926, Serial No. 1412,67?.` and in Germany November, 1925.

The present invention relates to rotary compressors of the kind used in connection with power engines of automobiles, and more particularly to a compressor in which an inner casing surrounding the rotor is caused to revolve therewith and providedpon the one @side only with a closing' wall or cover adapt ed tolparticipate inthe rotary movement of the casing.

The objectof my invention `is to provide a rotary compressorvof the last mentioned type for supplylngthe motor with air or an explosive mixture in compressed condition for the purpose of increasingr the charge of the 1.5 cvlinders and thereby causing the torque of i the ymotor to increase accordingly.

With this object in `view .my improved compressor is,

kadaptedvto be etlcie'ntieven at the lowest speed of revolution, to supply the motor with aprfeliminarily compressed charge so that kan increased motor torque willeven pre- Ivailon Lstarting the;vehicle,and in order to realize this result I provide means for tightening the working parts perfectly or to such a degree that the unavoidable wear and tear will not do any harm in this respect.

lVith the above 1recited and other objects in `view the invention resides in the novel construction set forth in the following specification, particularly pointed out in the. appended claims and illustrated in vthe accompanying drawings, it being understood that the right is reserved to include embodiments other than thosey actually illustrated herein. to the fullextent indicated by the general meaning of the terms in which-the claims are expressed. l

In` the accompanying drawings forming a part of 4this specification and wherein like characters designate like parts throughout the several views Figure 1 is a front view of the improved compressor partly in section and with the cover removed; y y e. Figure 21s a vertical section taken on the line A-B in .Figure lvi'iand ,Figure is a fragmentary` view of a constrn'ctional modification.

Referring to the construction' shown in Figures 1 and 9. the compressor comprises a stationaryouter casingr ladapted to be closed b v a circular cov'er 2 roller bearings?) being provided in both the cover and the wall of when coupled with theA motor,

the casing, and a shaft 4 is duly supported in the two bearings 3. Keyed to the shaft 4 is' a rotor 5 of double T or I section having four diametrically opposed radial' grooves or slots 6 eachv extending over the full length of the rotor, for the reception of four sliding plates 7. Therotor 5 is en cased in a cylindrical inner casing 8 of the very saine length as the rotor and the slides 7. The casing-8 is open at the one side,y that Vis towards the cover 2, and closed at the other side only by an annular plate or cover 9, having a wide central aperture and an outer annular flange of conical shape, as will be clearly seen in Figure 2.

.JIn the part of the outer ycasing 1 shown in section in Figure 1 a roller 10 is provided to permanently hold the inner casing 8 in linear contact with the rotor 5. The roller 10 is mounted on roller bearings suitably supported by a shaft 11 duly journalled in bearings of the casing l. In the lower end of the outer casing a similar roller 13 is provided to support the. inner easing 8 and the roller 12 is likewise mounted on roller bearings supported by ay shaft 13 duly journalled in bearings of the casing 1. The journals 14 of the two shafts 1l and 13 are eccentrically disposed in respect to the axes of the shafts and duly titled inboxes 15 and 16, respectively.

The box 16 :is provided with an outer plate 17 and adapted to be turned about the journal 14 therein, an arcuate slot inthe plate and a threaded bolt witha nut 18 serving to securethe plate 17 in its position. Riveted in thc box 16 is a pin 19 so as to extend diametrically therein and to engage in a longitudinal slot of the journal 14. Upon nnscrewing the nut the plate 17 with the box 16 may be turned to any desired position and when turned, the pin 19 will canse the journals 14 and the shaft to turn simultaneously therewith to the like extent. In consequence thereof the roller 12 may be raised or lowered depending upon the direction in which the plate 17 is turned. owingto the eccentricity of the journals 14'. The roller 10 being constructed and arranged in the same manner as described with regard to the roller 12, it will be possible to adjust the roller 10 in a. similar way to hold the inner casing 8 in intimate contact with the roller 10 and with the rotor 5.

In a` compartment formed in the rear ofl the outer casing 1 a conical roller 20 is provided. The journals 21 of the roller 20 are supported in roller bearings mounted in the wall of the c lvforming the said compartment. The ower journal 21 is bored and a small coiled ring 22 is lodged in the bore, a screw 23 being provided inthe cap enclosing the free end of the journal, to exercise a pressure on the ring 22 and to thereby hold the roller 20 in contact with the conical annular flange of the plate or cover 9. Due to the conical shape of the roller 20 the latter exercises, under the action .of the spring 22, an axial pressure on the plate or cover 9 thus causing the cover 9 in turn to contact with the rear end of the rotor 5, and at the same time the inner casin and the. front end of the rotor 5to be hell? contact with thecover 2.

The cover 2 two slots24 and 26 with ducts or passages in front thereof leading tolanged sockets 25 and 27, respectively. The front end or edge of the rotor 5 is cut out to form tapering recesses- 28 on its outer'side throughout the whole ofthe periphery thereof and it will be seen that these recesses 28 giving the front end or edge of the rotor a toothed appearance, are adapted to communicate with the aforestated slots 24 and 26.

In the embodiment or modification shown in Figure 3 the slides 7 adapted to reciprocate in the radial slots 6 are dispensed with and in substitution therefor flap valves 34 are provided in the rim portion of the rotor 32 keyed to the shaft 31. Each valve 34 is pivotally connected to the rim by means of pins 35 and adapted to snugly fit a recess of the rim so that when the valve is closed, the outer surface thereof will lie Hush with the peripheral surface of 'the rotor. The several valves 34 are equipped with springs 36 on the inner sides thereof in order to be continnall inner casing 33 revolving along with the rotor.

As regards the dimensions of the slot 24 inthe cover 2 for emitting the compressed gases, the radial length thereof is equal' to the distance between the periphery or rim of the rotor 5 and the inner surface of the inner casing 8, at the place of communication plus the greatest depth of the recess 28 as will be seen .in Figure/2. supposing the recesses 28 were not provided in the rim of the rotor, the free sectional area. of the slot 24 would be too small in case of the compresser running at high speed, so that very high gas speeds in the slot necessarily would result therefrom and consequently Avery high gas pressures would be produced in the Acon- (lensing chamber.- ing the depth of the recesses 28 the free sectional area of the emittin slot 24 may be increased to twice the eciency of a slot held in linear contact with the By suitably dimension- `without any cooperating recesses. It will be advisable, however, to 've the single recesses a limited or m length only in order to not interfere with the tightening requirement at the point where the roller 10 holds the inner casin 8 in linear contact with the rotor 5. Iii. goes without saying that the recesses may just as well be provided in the inner surface of the cylindrical casing 8 instead of in the outer surface of the rotor 5, as shown.

The plate or cover 9 is firmly connected with the inner cylindrical casing 8 by means o f screws or the like, as shown, but as an alternative such connection may be diS- pensed with and the cover 9 may be rigidly attached to the rotor 5 instead, or the cover may be provided with a suitable hub sup ported by the shaft so as to be revoluble Vthereon without having any mechanical connection with the casing 8 or' the rotor 5. In all of these eventualities the cover 9 will be forced against and held in contact with the inner casing 8 and the rotor 5 through the 'agency of the conical roller 20 or any equivalent means to be provided for the pur ose and will constitute a closing wall fitte to the rear of the revolving inner caing 8 and rotating together therewith.

In order to provide, in case of h igh -rotary speeds, short ways for the gas iiowing in and ont of the com ressor, two narrow rotors may be employe in lieu of the wide rotor 5 shown in the drawings and thc two rotors may be mounted,.each in a separate cylindrical inner casing, on a common shaft close adjacent to each other.

The bottom part of the compressor casing 1 may be filled with a suitable oil in order to ensure an automatic lubrication of the working member and to obtain a better cooling of the compressor.

Supposing the rotor 5 is revolved by the power-driven shaft 4 in the direction of the arrow shown in Figure 1, it will seen that the inner cylindrical casing 8 will, at the same time, be caused to rotate with the same peripheral speed owingto the pressure exerted by the roller 10 to hold the casing 8 in contact with the rotor 5. At higher speeds the slides 7 will act in a. similar manner to revolve\the casing 8 since they are resscd towards and against the inner sur ace of the casing 8 by centrifugal action. At the same time the slides 7 will perform reciprocating movements in accordance with the eccentrical position of the cylindrical inner' casing 8. The gas to be compressed is sucked in through the tubular socket 27 and Hows through the duct and the slot 26 into the upper part of the crescent-shaped working chamber of the machine, subsequently the sucked in gas is compressed in the lower erate peripheral' The operation of the compressor is as foling `\Vhen, however,

ing the continued revolution of the rotor 32,

` in the recess provided in the will act to the same effect as partlor half ofthe working chamber and then emitted through the slot 24, the duct, and they tubular; socket to be conveyed to the place of application byjmeans of suitable piping and the like;

' If valves 34 are iprovided as in Figure 3 in substitution for ,the slides 7', the valves the slides, for it will beunder'stood by those skilled in the art to which my invention relates, that the yvalves 34 willv turn about their pivots 35 in accordaneyfwith the increasing and decreassectional areafof the crescent-shaped chainbenformed between therotor 32 and the rotating inner casing 33, so as to always` occupy the full sectional area thereof.

a valve 34 approaches, dur'- the'place where the rotor and the rotating casing 33 meet or coniein contact with each other, the samefwill be forced down against the action of the springBG, to lie embedded `rim or periphery of the rotor. The springs 36 mainly act `to ensure a tight contactbetween the valves 34 and the inner face'of the rotating casing 33 when the machine is running at lower speeds.` c f f At higher speeds the slides 7 abut on the linner casing 8 with great pressure`l but as the easing 8 continuouslyfrei'iolves together with the rotor,` expenditureor loss of power due to the frictional engagement between the slides 7 (or valves 34) yand the inner cylindrical casing is inconsiderable only. The pressure produeedb .the compression of the gases in the lower part of thel compressingr chamber tends to force tliecyliiidi-.ical cas` i to intercept the pressure resulting from the ing 8 of the rotor 5, but such pressure is rc- `sisted or received by the two' rollers 10 and l12. (')n theother hand the conical roller .29 engaging the rear "cover or wall 9 will act gas compression and actingion the cover 9, in the-direction of the axis of the revolving sys-4 tem. LAt the same time the counter-pressure of the roller will ensure a reliable tightening between the hfopen end faces of the rotor and the two covers 2 and 9 closing tlie'saine. The spring 22 will automatically control the proper closurelof the parts even Yin compensation for wear and tear shouldv the lateral sliding faces of the rotor and the rotating casing wear away in the course of time.

As a 'gas pressure prevails only on the lower ypart ogf the corel-9 which contines latei'ally they 4compressing chamber,` wherei 'as in thc upper part-of the'y chamber a partial vacuum oriindernressure exists in consequence of the sucking actionitheroin, 1t will he seen that the provision of a kcounteractin'groller 20 is notlrequired for the tightening `purpose except in thellower part i of. the" machine; as'shown, As" the4 roller ,20 is located yat a kpointfwhere the cover 9 is subjected to the full action of the coinpressed gases, and as the roller 2() thus is adapted to counteract the gas pressure in the best possible way, it will be seen that a least possible f counter-pressure only is utilized for the tightening purpose and therefore the unvoidable losses due to frictional wearing are minimized.

1. A rotary compressor comprising an outer stationary casing; .a power-driven shaft journalled in said casing; a rotor mounted on said-shaft; anA inner cylindrical casing surrounding said rotor andv adapted to rotate therewith; a plate for closing the cylindrical casing at one end thereof and adapted to rotate therewith; and a roller in the stationary casing for exerting an axial pressure on the plate thereby causing the plate to contact with the cylindrical casing and one end of the rotor and causing the cylindrical casing and the other end of the rotor to beheld in contact with the outer stationary casing.

2. A rotary compressor comprising an outer stationary casing having bearings ,i

therein; aV power-driven shaft journalled in said bearings; a rotor keyed on said shaft; an inner cylindrical casing surrounding said rotor to he held in contact with the outer,

stationary casing.

outer stationary casing; a power-driven shaft journalled in said casing; a iotor mounted on said casing surrounding said rotor and adapted to rotate therewith; a plate for closing the cylindrical casing at one end thereof and adapted to rotate therewith; and a springl pressed roller inv the stationary casing for exerting an axial pressure on theplate thereby causing the plate to` contact with the cylindrical casing and one lend of the rotor and causing the cylindrical casing and the 3. A rotary compressor comprising air shaft; an inner cylindrical i other end of the rotor to be held in contact Y with tlie outer stationary casing. y

4. A rotary compressor comprising an outer stationary casing having bearings therein; a power-driven shaft journallefl in said 'b eai'ings; a. rotor keyed on said shaft; an inner cylindrical casing surrounding said rotor and adapted to rotate therewith: means in 'said rotor and contacting with said cylindrical easing forming compression chambers therewith; a plate for closing the cylindrical casing at one end thereof and adapted to rotate therewith; a roller in the in the stationary casing for conveying the air to and from the rotor.

5. A rotaryv compressor comprising an outer stationary casing; a power-driven shaft journalled in said casing; a rotor mounted on said shaft; an inner cylindrical casing surrounding said rotor and adapted to rotate therewith; a. plate for closing the cylindrical casing at one end thereof and adapted to rotate therewith; a roller in the stationary casing for exerting an axial pres- Sure on the plate thereby causingr the plate to contact with the cylindrical casing and one end of the rotor and causing the cylindrical casing and the other end of the rotor to be held in contact with the outer stationv .al casing; and a lurality of supporting ro e rs f or the cylin ical casing, one of said supportmg rollers -holding the cylindrical caiong 1n contact with the periphery of the ro r.

6. A rotarycompressor com rising' an outer stationary openings therein; a power-driven shaft journalled 1n said casing; a 'rotor keyed on said shaft and having recesses in the periphery thereof adapted to cooperate'with the openings in the casing; an inner cylindrical casing surrounding said rotor and adapted to rotate therewith; and a plate for closing the cylin-A drical casing at one end thereof.

7. rotary compressor comprising an outer statlonary casing having inlet and outlet opemngs for the air; a power-driven shaft ]ournalled in said casing; and a rotor keyed on said shaft and having recemes in the perlphery thereof adapted to cooperate with the openings in the casing.

8. A rotary compressor comprising an outer stationary casing having inlet and outlet openings for the air; a power-driven shaft Journalled' said casing; a rotor keyed on said shaft; an inner cylindrical casing surrounding said rotor andadapted to-rotate therewith: and a plate for closing the cylindrical casing at one end thereof and adapted to rotate therewith, said rotor having recesses in the periphery thereof opposite the plate adapted to cooperate with the openings in the casing.

9. A rotary compressor comprising an outer stationary casing having inlet and outlet openings for the air; a power-driven shaft journalled in said a rotor keyed on said shaft; an inner cyndrical casing surroundin said rotor and adapted to rotate therewit a plate for closin the cylindrical casing at one end thereof an adapted to r0- 'tate therewith, said rotor having recesses in the periphery thereof opposite the plate adapted to coo crate with the openings in the casing; an a roller in the stationary casing for exerting an axial-pressure on the plate thereby causing the plate to contact with the cylindrical casing and one end of the rotor and causin the cylindrical casing andthe other end o the rotor to be held in contact wtih the outer stationary casing.v

10. A rotary compressor comprising an outer stationary casing having inlet and outlet openings for the air; a power-driven shaft journalled in said casing; a rotor keyed on said shaft; an inner cylindrical casing surrounding said rotor and ada ted to rotate therewith; a plate for closing the cylindrical casing at one end thereof and adapted to rotate therewith, said rotor having recesses in the periphery thereof opposite the plate adapted to cooperate with the openings in the casing; a roller in .the stationary casing for exerting an axial pressure on the plate thereby causing the plate to contact with the cylindrical casmg and one end of thevrotor and causing the cylindrical casing and the other end of the' rotor to be held in contact with the outer stationary casing; and a plurality of -supporting' rollers for the cylinfw drical caslng, one of said supporting rollers holding the cylindrical casing in contact with the periphery of the rotor.

11. A rotary compressor comprising an outer stationarycasing having inlet and outlet openings for the air; a powerdriven shaft journalled in said casing; a rotor keyed onsaid shaft; an inner cylindrical casing surrounding said rotor and adapted to rotate therewith; a plate for closing the cylindrical casing at one end thereof and adapted to rotate therewith, said rotor having recesses in the periphery thereof opposite the plate adapted to cooperate with the openings in the casing; a roller in the stationary casing for exerting an axial pressure-on the plate thereby causing the plate to contact with the cylindrical casing and one end of the rotor andcausng"the cylindrical casing and the other end of the rotor to be held in contact with the outer stationary casing; a plurality of supporting rollers for the cylindrical casing, one of said supporting rollers holding the cylindrical casing in contact with, the periphery of the rotor; and means in said rotor and contacting with said cylindrical casing forming compression chambers therewith.

12. A rotary compressor comprising an outer casing; a power-driven shaft journaled in said casing; a rotor mounted on said shaft having a front and a rear end, the front end of said rotor being adjacent the outer caslub ing; an kinner*cylindrical casing surrounding cylindrical casing and the Tear end of the sald rotorfand ada'ptedto rotate therewith; rotor and also causing the cylindrical casn plate for closing the cylindrical casing at ing and the front end of the rotor to be held n one end thereof andadapted to rotate there-AV in contact. with the outer casing. Y i with; and a roller'in `the 'outer casing for In testimony whereof I ax my signature.

exerting an axial pressure on the plate there-4 by causing the plate to contact with the PAULV SCHAUER. 

